Stephen Hawking thought a form of string theory could be our best bet for a 'theory of everything'.

Looking up in the main chamber at SNOLAB’s facility in the Vale Creighton nickel mine in Sudbury, Ont., a giant spherical neutrino sensor array the size of a 10 storey building is used to detect subatomic particles that pass through the earth.
(Handout)
November 28, 2017

A cubic kilometer of clear, stable ice could help physicists answer big questions about cosmic rays and neutrinos. Hardy scientists collect data via a unique telescope at the frozen bottom of the world.

You can feel the weight of an object on Earth because of its mass. But what is mass?
Flickr/Jeremy Brooks
November 11, 2015